ECE331 Winter11 lecture 4

ECE331 Winter11 lecture 4 - Theoretical Density, Density =...

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Theoretical Density, ρ ensity Cell Unit in Atoms of Mass Density = ρ = n A Cell Unit of Volume Total V C N A ρ = where n = number of atoms/unit cell A = atomic weight V C = Volume of unit cell = a 3 for cubic N A = Avogadro’s number = 6.023 x 10 23 atoms/mol
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Theoretical Density, ρ • Ex: Cr (BCC) A = 52.00 g/mol R = 0.125 nm n = 2 a = 4 R / 3 = 0.2887 nm a R 2.00 atoms nit cell g 7 18 g/cm ρ theoretical ρ actual ρ = a 3 52.00 2 unit cell mol olume toms 6.023x10 23 = 7.18 g/cm 3 = 7.19 g/cm 3 unit cell volume atoms mol
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Densities of Material Classes ρ metals > ρ ceramics > ρ polymers hy? Graphite/ Ceramics/ Semicond Metals/ Alloys Composites/ fibers Polymers 30 sed on data in Table B1, Callister In general Why? 20 Based on data in Table B1, Callister *GFRE, CFRE, & AFRE are Glass, Carbon, & Aramid Fiber-Reinforced Epoxy composites (values based on 60% volume fraction of aligned fibers in an epoxy matrix). 10 u Ni Silver, Mo Tantalum Gold, W Platinum Metals have. .. • close-packing etallic bonding) cm ) 3 4 5 Steels Titanium Cu,Ni Tin, Zinc i nitride Diamond Al oxide Zirconia (metallic bonding) • often large atomic masses Ceramics have. ..
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This note was uploaded on 04/30/2011 for the course ECE 331 taught by Professor Rajan during the Spring '09 term at Ohio State.

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ECE331 Winter11 lecture 4 - Theoretical Density, Density =...

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